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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)36A-9233 <br /> 404 N Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(9l6)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> i*EA Engineering Science &Tech Client Prof ID Exxon 7-3942, 5153942 1306 Sampled 11/18/98 - <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descnpt MWS Received 11/19/98 <br />' Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 11/29/98 <br /> Attention Chnsta Marting Lab Number 9811 D70-07 -Reported 12103198- <br />`QC Batch Number GC112998BTEX02A <br /> Instrument ID GCHP02 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br />' Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> TPPH as Gas 2500 27000 <br />' Methyl t-Butyl Ether 125 N D <br /> Benzene 25 38 <br /> Toluene 25 220 <br /> Ethyl Benzene 25 2900 <br /> Xylenes (Total) 25 7100 <br /> Chromatogram Pattern GAS <br />' Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 118 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> Mel Mei Shin <br />�fect Manager <br /> Page 7 <br />